非对称闭合磁场X点附近带电粒子动力学
Charged particle dynamics near an X-point of a non-symmetric magnetic field with closed field lines
摘要：
了解粒子在非对称磁场中的漂移是设计优化仿星器以最小化粒子的新经典径向损失的主要兴趣。准对称性和全方位性，两个不同的属性，提出以确保径向本地化的碰撞捕获粒子的仿星器，已被探索几乎完全的磁场产生嵌套通量表面。在这项工作中，我们扩展这些概念的情况下，所有的场线是封闭的。然后，我们研究带电粒子动力学在精确的非对称真空磁场与封闭的场线，最近得到的Weitzner和Sengupta（arXiv：1909.01890），其中具有X点。磁场可用于构造等离子体压力为零的磁流体动力学平衡。扩展的非对称领域的振幅，我们明确评估的全向和准对称约束。我们表明，磁场是全方位的意义上的漂移面与压力面重合。然而，根据标准定义，它不是准对称的。
英文摘要：
Understanding particle drifts in a non-symmetric magnetic field is of primary interest in designing optimized stellarators to minimize the neoclassical radial loss of particles. Quasisymmetry and omnigeneity, two distinct properties proposed to ensure radial localization of collisionless trapped particles in stellarators, have been explored almost exclusively for magnetic fields that generate nested flux surfaces. In this work, we extend these concepts to the case where all the field lines are closed. We then study charged particle dynamics in the exact non-symmetric vacuum magnetic field with closed field lines, obtained recently by Weitzner and Sengupta (arXiv:1909.01890), which possesses X-points. The magnetic field can be used to construct magnetohydrodynamic equilibrium in the limit of vanishing plasma pressure. Expanding in the amplitude of the non-symmetric fields, we explicitly evaluate the omnigeneity and quasisymmetry constraints. We show that the magnetic field is omnigeneous in the sense that the drift surfaces coincide with the pressure surfaces. However, it is not quasisymmetric according to the standard definitions.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
